Police in Ireland have been accused of stringing along a coroner and the family of murdered IRA spy Denis Donaldson with bogus claims.

As the eighth anniversary of his killing at a remote famine cottage in Co Donegal approaches next week, lawyers for the family there is no bona fide reason for an inquest into his death not to go ahead.

In a statement issued through their legal team, the Donaldson family said their treatment is consistent with a series of scandals to hit the Garda force over the last few months and claimed some people involved in the controversies have had direct involvement with their case.

Denis Donaldson was murdered in 2006

" The gardai are now stringing along the coroner's court and the family with bogus claims and a flagrant disregard for European Court of Human Rights obligations," they said.

"The effectiveness and independence of the investigatory process, and the completed Garda investigation, has lost any credibility," they said.

Mr Donaldson, 55, a senior Sinn Fein official and close colleague of party president Gerry Adams, was shot dead at an isolated cottage near Glenties in April 2006.

He had been living there since his exposure as an MI5 agent the previous year.

The Real IRA claimed responsibility for the murder three years later but the circumstances surrounding Mr Donaldson's outing and subsequent assassination have been shrouded in mystery.

The family said they have no faith in the Gardai and refused to attend the latest preliminary hearing of the inquest, the 13th since the killing.

"From the outset the Donaldson family have implored Gardai to rigorously investigate the role played by state agencies in the circumstances surrounding the exposure and killing of Denis," they said.

"Throughout that time, Gardai have refused to probe these concerns and admitted to the family that they closed the file on Denis's death without interviewing those members of Special Branch who were actively involved in events leading up to Denis' killing."

The Donaldson family said that at previous hearings they have heard explicit assurances that no further time would be required by either gardai or the Director of Public Prosecutions to examine the case.

The family claims lawyers for the Minister for Justice Alan Shatter have consistently contested their attempts to have the inquest heard.

They have instructed their legal team to take a lawsuit over what they claim are ongoing infringements of the human rights of the Donaldson family.

In November 2012 the inquest was told a file on the murder had been submitted to the DPP and a d ecision on a prosecution was expected within four months but no-one has been charged. Several arrests have been made.

"Everyone, Republican or otherwise has their own particular part to play. No part is too great or too small, no one is too old or too young to do something."

~Bobby Sands 1954-1981~

'Mother Erin'

Two divine persons in one. A mother lamenting her children in bondage. A girl ravished by the Saxon, who weeps over her stringless harp. But her young champions keep watch in the mountains, awaiting the dawn of the bright sun of Freedom. They will gather around her with pikes and swords.